Core Viewpoint - The article highlights the historical and engineering significance of the Luoyang Bridge, recognized as China's first cross-sea beam stone bridge, and its role in the development of transportation and trade in the region [1][8][10]. Group 1: Historical Significance - Luoyang Bridge, located in Quanzhou, Fujian Province, was built during the Northern Song Dynasty and is the oldest existing cross-sea beam stone bridge in China, measuring approximately 731 meters in length and 4.5 meters in width [4][8]. - The bridge is part of the "Four Great Ancient Bridges of China," alongside Lugou Bridge, Zhao Zhou Bridge, and Guangji Bridge, showcasing its importance in Chinese architectural history [1][8]. Group 2: Engineering Techniques - The construction of Luoyang Bridge utilized innovative techniques such as the raft foundation method, which was crucial for building on the soft riverbed and managing tidal influences [14][20]. - The bridge's design included ship-shaped piers to reduce water flow impact, and the use of oysters for biological protection of the piers was a pioneering application of biology in bridge construction [22][20]. Group 3: Economic Impact - After its completion, Luoyang Bridge transformed transportation routes, facilitating direct access from Quanzhou to Fuzhou and enhancing trade connections, which led to a significant increase in the flow of people and goods [24][26]. - The bridge initiated a large-scale bridge-building movement in Quanzhou during the Song and Yuan dynasties, with approximately 170 stone bridges constructed, further boosting overseas trade [26]. Group 4: Cultural Heritage - The bridge features numerous historical artifacts, including stone generals and inscriptions, which provide valuable insights into the craftsmanship and artistic values of the Song Dynasty [6][27]. - Luoyang Bridge has undergone 26 repairs over nearly a thousand years, with each repair reflecting the historical changes and preservation efforts [37]. Group 5: Modern Preservation Efforts - Modern preservation techniques include the installation of monitoring systems to track structural integrity, ensuring the bridge's longevity while maintaining its historical essence [49][51]. - The local community continues to engage with the bridge's heritage, with the surrounding area evolving into a cultural landmark that attracts significant tourism, with nearly 800,000 visitors since 2025 [62].